Quantum DLT-S4 Guía de usuario descargar pdf (Pagina 191)

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101

Chapter 4 SCSI Commands

MODE SENSE (6) / (10) Command (1Ah / 5Ah)

DLT-S4 Interface Reference Guide 157

MODE SENSE (6) / (10) Command (1Ah / 5Ah) 4

The MODE SENSE command allows the tape drive to report its media type

and current—or changeable—configuration parameters to the host. It is a

complementary command to

MODE SELECT.

Figure 80

shows the CDB for the 6-byte MODE SENSE (1Ah) command.

An illustration of the CDB for the 10-byte

MODE SENSE (5Ah) command

is shown in figure 81

Figure 80 MODE SENSE (6)

Command Descriptor Block —

Data Format

The 10-byte MODE SENSE command is required to request the vendor-

specific EEPROM parameter page due to the large amount of data that

parameter page contains.

MODE SENSE (10) can be used to retrieve the

other pages as well. Note that

MODE SENSE (10) returns descriptor data

in a different format than

MODE SENSE (6).

Bit

Byte

7 6 5 4 3 2 1 0

0 Operation Code (1Ah)

1 Reserved DBD Reserved

2 PC Page Code

3 SubPage Code

4 Allocation Length

5 Control

Note: The drive returns a CHECK CONDITION status with Sense Key

set to

ILLEGAL REQUEST if it receives an unsupported Page

Code or a Page field with values not supported or not

changeable. In such cases, the drive does not change any

parameters as a result of the command.

1 2 ... 186 187 188 189 190 191 192 193 194 195 196 ... 385 386

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